<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录界面</title>
    <style>
        * {
            padding: 0%;
            margin: 0%;
        }
        .a {
            width: 400px;
            height: 250px;
            background-color: pink;
            margin: 0 auto;
            box-sizing: border-box;
            padding-left: 100px;
            
        }
        .a .b{
            border: 1px solid black;
            margin: 20px;
            
        }
        .b {
            width: 200px;
            height: 20px;
            background-color: #fff;
        }
        .c {
            width: 100px;
            height: 20px;
            background-color: #fff;
            text-align: center;
            border: 1px solid black;
            /* padding-top: 50px; */
            
        }
    </style>
</head>
<body>
    <div class="a">
        <div class="b">用户:</div>
        <div class="b">密码:</div>
        <div class="c">登录</div>
    </div>
</body>
</html>